JP2001145255A - Switch-controlling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely prevent the locking of the unneeded open state of a division switch. SOLUTION: The switch-controlling device is provided with a backup power supply 22 for forming an operation power supply in system power failure; a means for starting a confirmation timer by opening switches 5a, 5b, and 5c due to the generation of system power failure after throwing the division switches 5a, 5b, and 5c to be controlled based on the re-closed circuit of a circuit breaker 3 of a substation 1 and at the same time setting an open flag, and controlling to the switches 5a, 5b, and 5c to the lock standby in open state; a means for comparing the measurement time of a timer with criterion time; a means for canceling the lock standby of the open state by resetting the open flag when the measurement time becomes criterion time or less and throwing the switches 5a, 5b, and 5c; and a means for locking the switches 5a, 5b, and 5c to an open state by ending the lock standby of the open state when the measurement time of the confirmation timer is longer than the criterion time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch control device used for controlling a segment switch of an electric power system.

[0002]

2. Description of the Related Art Conventionally, in a power system such as a high-voltage distribution system, as shown in a single-line diagram in FIG. 10A, a secondary side of a transformer 2 of a substation 1 is connected via a circuit breaker 3. The extracted distribution line 4 is divided into a plurality of sections # by a plurality of section switches 5.
0, # 1, # 2, # 3,...
Is controlled by the respective switch control devices 6.

Each control device 6 is supplied with power from a transformer 7 on the upstream side (power supply side) of each of the controlled switchgears 5, and also controls the divided switch 5 to be controlled and the next switchgear on the load side. The sections # 1, # 2, # 3,... With the transformer 5 are defined as own sections, respectively, and the presence or absence of a system voltage upstream of the own section is monitored and detected from the voltage of the transformer 7.

[0004] When an accident such as a ground fault or short circuit occurs in any section of the distribution line 4 and the circuit breaker 3 of the substation 1 is opened to cause a system blackout due to the accident, generally, a time-sequential progressive system is used. The circuit breaker 3 of the substation 1 is reclosed and reclosed at the time intervals set by the trial charging, and during that time, the sectional switch 5 in the accident section is locked in the open state to restore the upstream healthy section.

That is, when an accident such as a ground fault or short circuit occurs in the section # 2, the circuit breaker 3 of the substation 1 is immediately opened based on the detection of an overcurrent or the like, and the distribution line 4 is outaged due to an accident. The switches 5 are opened by the respective control devices 6 on the basis of the voltage loss on the upstream side.

[0006] Then, one minute after the occurrence of the accidental power failure (opening of the circuit breaker 3), the circuit breaker 3 is reclosed, and each of the sectional switches 5 is moved to the most upstream position based on the respective upstream power restoration. Are timed in order from the section # 1.

When the section switch 5 of the section # 2 is closed again by this timed closing, the circuit breaker 3 is opened again and the distribution line 4
Turns off again within one minute after the circuit breaker 3 is reclosed.

At this time, the section switch 5 of the section # 2 is locked in the open state because the system voltage is lost within the fault section detection time period set after the power recovery on the upstream side.

After one minute has passed from the re-closing of the circuit breaker 3 and further four minutes (1 minute + 3 minutes) have elapsed, the circuit breaker 3 is re-closed. , The section switch 5 of section # 1 is first timed,
The section # 1 on the load side is restored.

[0010] Even if the closing time elapses after the power recovery in section # 1, the section switch 5 in accident section # 2 is locked in the open state and is not closed, and accident section # 2 is disconnected from the system.
As shown in FIG. 10B, a healthy section # on the upstream side thereof
Recovery of 0 and # 1 is completed.

By the way, the closing time of the re-closing circuit and the re-closing circuit of each switchgear 5 is, for example, 7 seconds, and the accident section detecting time is, for example, 5.5 seconds.

In this case, each of the sectional switches 5 is turned on after 7 seconds from the power recovery on the upstream side, and 5.5 is turned on from this turning on.
If there is a power failure within seconds, it will be locked open.

On the other hand, in recent years, in order to divide the power system into more sections without increasing the time required from the power failure of the accident to the restoration of a healthy section, each of the section switches 5 has the above-mentioned 7 seconds or the like. It has been practiced to mix a timed input and a timed 0 second.

In this case, for example, as shown in FIG. 10 (c), a sectional switch 5a with a closing time of 7 seconds and a sectional switch 5b with a closing time of 0 seconds are provided alternately.

In FIG. 10C, two consecutive sections # 1 'and # 2', # 3 'and # 4',...
.. Correspond to one section # 1, # 2,.

Then, each of the sectional switches 5a having a closing time of 7 seconds is closed by re-closing and re-closing, and the sections # 1 ', #
3 ',... As soon as each of the power is restored, the switchgear 5b with a time limit of 0 seconds on the load side thereof is immediately turned on and the section #
2 ', # 4', ... are also restored.

At this time, for example, if the section # 4 'is an accident section, when the section # 3' on the upstream side is restored due to reclosing, the accident section # 4 'is restored almost at the same time. The section switch 5b having 4 'as its own section is immediately locked in the open state, and the section # 4' is an upstream section # 0 'to # 3'.
From the normal section # 0 '
# 3 'is restored.

Therefore, it is possible to double the number of sections of the distribution line 4 and lengthen the section to be restored with a reclosed circuit, without making the entire sequential power-on time longer than before.

[0019]

In the electric power system divided by using the above described switchgear 5b with a time limit of 0 second, there are the following problems.

First, as shown in FIG. 11, the upper system of the transformer 2 of the substation 1 comprises a service system 8 and a backup system 9,
When the systems 8 and 9 are alternatively selected by opening and closing the circuit breakers 10 and 11, for example, if an accident occurs in the service system 8 being selected with priority, the upper system on the primary side of the transformer 2 becomes a so-called normal system. By the preliminary switching, the system 8 is switched to the standby system 9 in about one second.

[0021] Specifically, when an accident occurs in the conventional system 8, the accident t ₁ at breaker 10 immediately as shown in (a) of FIG. 12 is opened by atmospheric spare switching of the, in FIG. t ₂ o'clock breaker 11 is delayed approximately one second from the time t ₁ as shown in (b) is closed is turned on, the upper line of the transformer 2 is switched to the spare line 9 from conventional systems 8.

By switching the upper system, section # 0 '
The system voltage V ₀ disappears at t _{1 and} returns to power at t ₂ , as shown in FIG.

Then, due to the disappearance of the system voltage V ₀ at t ₁ , the section switch (hereinafter referred to as # 1 ′ switch) 5 a having the section # 1 ′ as its own section and having a 7-second time limit of the most upstream flow is set to the same state. is opened at tx delayed one second before and after the time t ₁ as shown in (d) of FIG.

Further, # 1 in accordance with the change of the system voltage V ₁ of the 'section # 1 in FIG based on opening and closing of the switch 5a (e)', a section # 2 'of the input timed 0 seconds to self interval section switch (hereinafter # 2 'switch hereinafter) closing command of the control device 6 and 5b is changed as shown in the figure (g), on the basis of the closing command, # 2'o'clock switch 5b also t ₁ It is released at the ty which is delayed by about 1 second from.

At this time, due to the difference in the operation characteristics of the switches 5a and 5b, the order of ty, t ₂ and tx is as shown in FIG. 12, and the # 2 'switch 5b is placed before the # 1' switch 5a. Opened, open (ty) of # 2 'switch 5b, breaker 11
(Tz) and the opening (tx) of the # 1 'switch 5a occur in order, the backup system 9 immediately before the opening of the # 1' switch 5a.
Is inserted, so that the section # as shown in FIG.
System voltage V ₁ of the 1 'between t ₂ ~tx, instantaneously restored.

Further, since this power recovery occurs after the power failure of the # 2 'switch 5b is released, the control device 6 of the # 2' switch 5b executes the re-closing control at the closing time of 0 second. As shown in (g), at the same time when the power is restored, a closing command (on command) of the # 2 'switch 5b is generated, and as shown in (f) of the figure, the # 2' switch is opened at tz immediately before tx. 5b is input.

[0027] Then, # 2 since the system voltage V ₁ of the 'section # 1 to tx time immediately after the switch 5b is turned' is lost, the section # 2 This loss of fault section detection time period within '
Is erroneously detected as an accident section, and at time tx, the # 2 ′ switch 5
b is locked unnecessarily open.

[0028] Therefore, # 1 from the time tx 'passed-on time period of 7 seconds of the switch 5a, when it is at t _3, # 1'
Even if switch 5a is turned on and section # 1 'is restored,
The 2 'switch 5b is not turned on, and a healthy section after the section # 2' continues to lose power, and since it is considered that the accident section has been normally separated, it takes time to notice this abnormality. There is a point.

Next, as shown in the three-phase connection diagram of FIG. 13, the three-phase high-voltage distribution line 14 drawn from the substation 12 through the three-phase circuit breaker 14 has phase lines 14a of A, B, and C phases. , 14
b, 14c are divided into sections # 0 ″,
# 1 ", # 2",..., And the most upstream section switch (hereinafter referred to as # 1 "switch) 5c having at least section # 1" as its section is a section switch with a closing time of 0 second. To
For some reason, for example, a C-phase single-line ground fault occurs on the power supply side of the circuit breaker 13 of the substation 12, and at time t ₁ ′ immediately thereafter,
High voltage fuse 15a of another phase of section # 1 ", for example, A phase
The same problem as described above occurs when a one-line ground fault also occurs on the three-phase load 16 side and the entire system is in a two-wire ground fault state due to the out-of-phase short circuit.

In FIG. 13, reference numerals 15a, 15b, and 15c denote high-voltage fuses at the power receiving end of the three-phase load 16.
c ₀ and Vac ₁ are line voltages between the A and C phases in sections # 0 ″ and # 1 ″.

When the two-line ground fault condition occurs at t ₁ ′, the line voltage Vac _{0 in} the section # 0 ″ disappears as shown in FIG. There phase line 14a in the closed state, 14c are short-circuited through the earth, on the basis of the loss of voltage Vac _0, # 1 "switch 5c, as shown in the same figure (b) is opened.

Further, when the fuse 15a is blown at t ₂ 'immediately after the opening of the # 1 "switch 5c due to the application of a large current based on the two-wire ground fault, the wire returns to the C-phase one-wire ground fault. The inter-voltage Vac ₀ is restored, and the controller 6 of the # 1 "switch 5c executes the re-closing control due to the restoration.

Then, based on the input command at the time t ₂ ′ of the control device 6, as shown in FIG.
The switch 5c is turned on again.

Further, when the circuit breaker 13 trips and opens based on the detection of the ground fault on the C-phase power supply side at time t ₃ ′ within the accident detection time limit from the re-input, as shown in FIG. Then, the line voltage Vac ₀ in the section # 0 ″ disappears again. At this time, in response to the release lock release command of the control device 6 shown in FIG. ”Switch 5
c is locked unnecessarily open.

Therefore, the circuit breaker 13 is turned on again at t ₄ ′, one minute after t ₃ ′, and the line voltage Vac ₀ in the section # 0 ″ is restored as shown in FIG. Also, as shown in (b) of the figure, the # 1 "switch 5c is kept open, and thereafter, based on the ground fault detection on the C-phase power supply side,
At time t ₅ ′, the circuit breaker 13 trips again and opens, and at time t ₆ ′ after this opening, even if the circuit breaker 13 is turned on again, as shown in FIG. It is kept open.

Then, even if the ground fault of the C-phase on the power supply side of the circuit breaker 13 is restored after that, the # 1 "switch 5c is not turned on, and each of the sections # 1 on the load side is sounder than the section # 0". ″, #
2 ″… continues to lose power.

Depending on the conditions, the unnecessary opening / closing as described above may be performed depending on the condition even if the controlled switching target switch is not the switching switch 5 with the closing time of 0 second but the so-called timed closing switch. Erroneous locking of the state may occur.

Unnecessary erroneous locking of the opened state of the controlled segmented switch is conventionally caused when the segmented switch is not closed within the closing time based on a closing command from the control device for some reason. Had also occurred.

It is an object of the present invention to prevent unnecessary locking of the segmented switch in the open state as much as possible.

[0040]

According to a first aspect of the present invention, there is provided a switch control apparatus according to the present invention, wherein a backup power supply for forming an operation power supply during a system power failure and a substation power supply are provided. When a system power failure occurs after the controlled switch is closed based on the circuit breaker reclosing, the controlled switch is opened, the open flag is set, and the controlled switch is locked in an open state. Means for activating the confirmation timer and means for comparing the measured time of the confirmation timer with a predetermined judgment reference time when power is restored on the upstream side of the controlled segment switch during standby for lock in the open state. Means for resetting the release flag when the measurement time of the confirmation timer is equal to or less than the determination reference time, releasing the lock standby in the open state, and closing the switch to be controlled; And means for locking an open state of section switches the exit and controlled object a lock wait in an open state when the measurement time is longer than the reference time.

Therefore, an instantaneous system power failure occurs due to some reason such as system switching on the upstream side instead of the original accidental power failure, during which the system power supply on the upstream side of the controlled switch is temporarily restored. However, if a power failure occurs immediately after the controlled switch is turned on, instead of immediately locking to an open state as in the conventional case, control is performed to determine whether or not this power failure is due to detection of a reclosed accident section. The target segment switch is opened in a lock standby state in the open state, and the confirmation timer is started.

When the power supply of the system is restored again by turning on the circuit breaker at the substation, the time measured by the confirmation timer,
Compare with a predetermined judgment reference time.

At this time, the judgment reference time is shorter than the time from the power failure after the circuit breaker of the substation is reclosed by the trial charging to the re-closure, and is longer than the instantaneous system power failure time based on the switching of the upper system. It is set to a long time, for example, one minute.

If the measurement time of the confirmation timer is equal to or shorter than the determination reference time, the lock standby in the open state is released, the switch to be controlled is turned on, and the measurement time of the confirmation timer is determined. During a longer normal operation, since the power is restored after a power failure based on the detection of the original accident section, the controlled segment switch is locked open.

For this reason, when a system power failure occurs due to switching of a higher system or the like instead of an original accidental power failure, the controlled segmented switch is not erroneously locked in the open state, and the unnecessary open state is locked. Is prevented.

Further, in the case of the second aspect, when the controlled switch is not closed within a predetermined closing time by the closing control, an open flag is set, and the controlled switch is set to the open lock standby state. Means for controlling and activating a confirmation timer, and means for comparing the measured time of the confirmation timer with a predetermined judgment reference time when power is restored on the upstream side of the controlled segment switch while waiting for an open lock. Means for resetting the release flag when the measurement time of the confirmation timer is equal to or less than the determination reference time, releasing the lock standby in the open state, and re-closing the controlled switch, and determining the measurement time of the confirmation timer. Means for terminating lock standby in the open state when the reference time is longer than the reference time and locking the controlled switch to the open state.

Therefore, even if the switch to be controlled is not turned on within the closing time for some reason, unnecessary lock of the open state is prevented.

[0048]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. (One Embodiment) First, one embodiment will be described with reference to FIGS. FIG. 1 shows a case where the present invention is applied to an electric power system similar to that shown in FIG. 11 in which the upper system includes a service system 8 and a standby system 9.
The point is that the opening and closing of b is controlled by the switch control device 17 having the configuration of FIG. 2 provided in place of the switch control device 6 of FIG.

As shown in FIG. 2 showing the # 2 'switch 5b, the sectional switches 5a and 5b are connected to each phase line 4 of the distribution line 4.
a, 4b, 4c main circuit contacts 18a, 18
b, 18c, a display auxiliary contact 18d interlocked with these contacts 18a to 18c, and a closing coil 19 and an open coil 20 of each of the contacts 18a to 18d.

Next, the switch control device 17 controls the distribution line 4
For example, the line voltages of the A and C phases of the phase lines 4a and 4c are supplied to the power supply input circuit 21 as a single-phase drive power supply (control power supply) by the transformer 7, and the power supply input circuit 21 supplies power to various parts in the apparatus. Is supplied and operates.

A power supply backup circuit 23 of a backup power supply 22 is connected to the power supply input circuit 21. Normally, the system power supply of the distribution line 4 is healthy, and the power is supplied from the transformer 7 via the power supply input circuit 21 and the power failure backup circuit 23. When the secondary battery 24 of the backup power supply 22 is charged and the power distribution line 4 loses power due to an accident or the like, power is supplied from the secondary battery 24 to each unit in the device via the power failure backup circuit 23 and the power supply input circuit 21. Accordingly, the switch control device 17 operates even during a power failure of the distribution line 4.

Further, the switch control device 17 has a control processing unit 25 having a microcomputer configuration. The control processing unit 25 includes a program memory 26a and a data memory 26.
b, a control output circuit 27, a display input circuit 28, a timer circuit section 29, and the like are bus-coupled.

Then, the control processing unit 25 executes the control program of the memory 26a, and thereby the control device 17
Firstly, the following means (i) to (iv) for preventing unnecessary locking of the open state due to erroneous detection of an accident section.

(I) When a system power failure occurs due to closing of the controlled switchgear 5a, 5b based on the reclosing of the circuit breaker 3 of the substation 1, the controlled switchgear 5a, 5b
b is released, the release flag of the control processing unit 25 is set to "1", and the control target segment switches 5a and 5b are controlled to be in the open lock waiting state, and the confirmation timer of the timer circuit unit 29 is started. means (ii) section switches 5a of the controlled object in lock wait in an open state, the upstream side of 5b has power recovery, the measurement time T ₁ of the confirmation timer, preset predetermined reference time Tref
(Iii) At the time of malfunction (when a false detection is made) in which the measured time T ₁ becomes less than or equal to the determination reference time Tref, the release flag is reset to “0” to release the lock standby in the open state, and control is performed. Time limit (0 seconds or 7 seconds) for which the target switch 5a, 5b is set
In means to inject (iv) measuring the time T ₁ is the normal operation longer than the reference time Tref (the power failure detection), section switches 5a of the controlled object to end the lock wait in an open state, 5b, namely accident Means for locking section switches in the open state

By executing the control program,
Secondly, the control device 17 also includes the following means (v) to (viii) in order to prevent unnecessary locking of the open state due to a mistake in insertion (failure).

(V) When the segmented switches 5a and 5b to be controlled are not closed within a certain closing time by the closing control, the open flag is set to "1" and the segmented switches 5a and 5b to be controlled are opened. (Vi) Similar to the means (ii) above, when power is restored on the upstream side of the controlled switchgear 5a, 5b during standby for lock in the open state. The measurement time T ₁ of the confirmation timer and the predetermined judgment reference time T
and means (vii) measurement time T ₁ for comparing a ref resets the open flag when equal to or less than the reference time Tref to "0" to unlock standby in an open state, the control target of the section switch 5a, 5b
Similar means cycling to means (viii) the (iv) a, section switches 5a of the controlled object to end the lock wait in an open state when the measured time T ₁ is longer than the reference time Tref, the 5b Means to lock open

The control program of the control processing section 25 comprises steps S _{1 to} S _{33 in} FIGS. 3, 4 and 5. Next, the section switch to be controlled is changed to the # 2 ′ switch in FIG. The operation will be described as 5b.

[0058] First, check the system voltage V _1, the presence or absence of the upstream side of the # 2 'switch 5b at step S ₁ in FIG. 3, when the system normally passes in affirmative (YES) the step S ₁ proceeds to step S _2, this time, if not in lock wait in an open state, the process proceeds to step S ₃ through the step S ₂ in negative (NO).

At the start of operation, since the # 2 'switch 5b is in the unlocked and opened (off) state, step S
₃ proceeds to step S ₄ to start-up control, and sets the charged time period Tx the timer circuit 29 starts its counting.

The closing time Tx is 0 second for the sectional switch 5b, and 7 seconds for the sectional switch 5a.

Then, the time-up of the closing time Tx is waited for in the loop of steps S ₅ , S ₆ and S ₇ , and when Tx = 0, the process proceeds from step S ₇ to step S ₈ in FIG. The closing control output of the ON command is supplied to the switch 5b, and the # 2 'switch 5b is actually closed and closed.

[0062] Further, in step S _9, the count starts by setting the charged confirmation timed Ts of about one second timer circuit 29, reaches Ts = 0 in step S _10, S _11, S ₁₂ of the loop By this time, it is monitored whether or not the # 2 'switch 5b is turned on.

Normally, the # 2 'switch 5b
There is turned on, fault detection shifts from step S ₁₁ to step S ₁₃ in FIG. 5 timed Ty (5.5 seconds) the timer circuit section 2
Set to 9 and count.

Then, in a loop of steps S ₁₄ , S ₁₅ , and S ₁₆ , it is monitored whether or not a system power failure or opening of the # 2 ′ switch 5 b occurs within the accident detection time period Ty from the time of closing, and if it is normal. if the process proceeds from step S ₁₆ to step S _17, to complete the reset open lock flag in the memory 26b to "0" in # 2 'switch 5b is turned by the step S _17.

Thereafter, in a loop of steps S ₁₈ , S ₁₉ , and S ₂₀ , a system power failure occurs, and the # 2 ′ switch 5 b is opened (turned off).
Alternatively, the presence or absence of the release control is monitored.

Next, if a ground fault occurs in the section # 2 'during this monitoring as shown in FIG. 1, the circuit breaker 3 of the substation 1 is tripped and opened, and the system power supply is lost, 2 '
Switch 5b is also opened, step S ₁₈ or step S ₁₉
From returns to the step S _1.

Then, when the circuit breaker 3 is reclosed, # 1 '
Switch 5a is timed up, the system power supply of section # 1 'is restored, the process proceeds from step S ₁ to step S _2.

[0068] At this time, # 2 'switch 5b is not waiting for a lock in an open state, since not even locked in an open state, step S ₄ from Step S ₂ through step S ₃
Migrated, the loop by # 2 'switch 5b of sets poured timed Tx Step S _5, S _6, S ₇ is timed charged again.

By the way, in the case of the # 2 'switch 5b, Tx
= 0 to be set to, in fact, when the system power supply is power recovery, immediately proceeds to step S ₈ from step S ₁ through step S ₂ to S _7, turning on the # 2 'switch 5b.

[0070] Furthermore, to set the charged confirmation timed Ts of, for example, about one second in step S _9, step S _10,
The loop of _{S 11, S 12, # 2} ' switch 5b monitors whether thrown into the timed Ts based on the input control of the incoming command.

[0071] Then, the normal operation to be put into the turned confirmation timing Ts sets the fault detection time limit Ty shifts from step S ₁₁ to step S _13, step S _14, S _15,
# 2 'switch 5b in fault detection time limit Ty monitors whether is opened tripped by the loop of S _16.

[0072] At this time, 'since it is fault section, # 2' section # 2 when switch 5b is mains failure is open to the fault detection time limit Ty, proceeds from step S _14, S ₁₅ to step S ₂₁ and the open lock flag of the memory 26b in the lock standby set to open state "1", start the confirmation timer of the timer circuit 25 in step S _22.

When the # 2 'switch 5b in the accident section is turned on, the system power supply is lost, the circuit breaker 3 of the substation 1 is opened, and the # 1' switch 5a is also opened, and the entire system is restarted. Power failure occurs.

[0074] Then, passed about three minutes after returning from step S ₂₂ to step S _1, the system power is restored by retrocession closing of the circuit breaker 3, the # 1 'switch 5a is turned section # 1' When resuming again, the program proceeds from step S ₁ to step S ₂ by the power recovery upstream.

[0075] At this time, # 2 'for switch 5b is locked waiting for the open state, step S from step S _2
Move to ₂₃ .

Then, the measurement time T _{1 of the} reclosing confirmation timer is calculated.
And a preset reference time Tref.

Incidentally, the determination reference time Tref is set to a time shorter than the time (about 3 minutes) from the power failure of the circuit breaker 3 to the re-closed circuit, for example, 1 minute.

Therefore, when an original system fault occurs in the self section # 2 ', when the circuit breaker 3 is closed again and the power is restored, T ₁ > Tref.

Therefore, steps S ₂₃ to S ₂₄
Migration was determined to open the lock to lock the # 2 'switch 5b to unlock standby in an open state in step S ₂₅ in the open state.

[0080] During this open the lock, the process proceeds to step S ₂₆ through the step S ₃ from the step S _25, step S
_26, S _27, 'keeping the switch 5b open, fault section # 2' loop by # 2 of S ₂₈ disconnecting from the system power supply.

After the accident is recovered, the memory 2 is manually operated.
The release lock flag of 6b is reset to "0" and #
When supplying control of 2 'switch 5b is generated, the step S ₂₈
Proceeds to step S ₈ from the step S ₈ and subsequent steps, # 2 'switch 5b is turned on, after turning is repeated loop monitoring step S ₁₈ to S _20.

[0082] Further, when the opening control manually or the like between the loop monitoring occurs, step S from step S ₂₀
Proceeds to step S ₃₀ through _29, repeat the process from step S ₁ in an open locked state.

By the way, # 1 'based on the above-mentioned ground fault accident
FIGS. 6A to 6I show flowcharts of operations of the respective parts related to the opening and closing of the switches 5a, # 2 'switches 5b and # 3' switches 5a.

FIG. 11A shows the system voltage V ₀ in the section # 0 ′, FIG. 12B shows the opening / closing of the # 1 ′ switch 5a, FIG. System voltage V ₁ , (e)
Is the opening and closing of the # 2 'switch 5b, (f) is its closing command,
(G) the 'system voltage V ₂ of, (h) is # 3' section # 2 closing of the switch 5a, (i) is its feed command.

In the figure, t1 is the occurrence timing of the ground fault, t2 is the reclose timing of the circuit breaker 3, and t3 is the reclose timing of the circuit breaker 3.

Then, when the circuit breaker 3 is reclosed, # 1 '
The switch 5a is closed for a time period (Tx = 7 seconds), and the section # 1 '
When system voltage V ₁ of the recovers, # 2 'switch 5b is Tx
= Immediately turned at 0 seconds, the start when the circuit breaker 3 again immediately after power failure open, this time, the control unit 17 of the # 2 'switch 5b is a measurement of the time period T ₁ in lock wait in an open state I do.

Then, in the case of an original accident power failure, T ₁ > Tref at the time of re-closing at t 3, and at this time,
The # 2 'switch 5b is locked in the open state and the accident section #
2 'is cut off.

Next, at the substation 1 in FIG. 1, while the circuit breaker 10 is closed and the service system 8 is selected, an accident occurs in the service system 8 as shown in FIG. Assume that the circuit breaker 10 is opened and the circuit breaker 11 is turned on as shown in FIG.

In this case, as shown in FIGS. 8A and 8B, the circuit breakers 10 and 11 open and close in opposite directions, and the circuit breakers 10 and 11 are both opened. An instantaneous power outage occurs in about one second.

Then, each of the switchgears 5a and 5b is opened due to the system power failure. Similar to FIG. 12, based on the difference in operation characteristics between the switches and the like, FIG. 8D and FIG. As shown in the figure, it is assumed that the # 2 'switch 5b is opened earlier than the # 1' switch 5a, and the # 1 'switch 5a is opened after the system power supply is restored when the circuit breaker 11 is closed.

FIG. 8C shows the system voltage V ₀ in the section # 0 ′, FIG. 8E shows the system voltage V ₁ in the section # 1 ′, and FIG. 8G shows the system voltage V ₁ in the section # 1 ′. is there.

In the drawing, t1 'is the opening timing of the circuit breaker 10, t2' is the closing timing of the circuit breaker 11, and t2 '
Reference numeral 3 'denotes a timing of restoring the system voltage due to the reclosing of the # 1' switch 5a.

Then, in the case of switching of the upper system, #
'In the control unit 17 of the switch 5b, t1 during loop monitoring step S _18, S _19, S ₂₀ of FIG 5' 2 mains failure when there is generated, at step S ₁₈ to step S ₁ of FIG. 3 returning, then, the power recovery system voltage V ₁ of the case # 1 't2 open immediately before the switch 5a', the process proceeds from step S ₁ to step S _2.

[0094] Then, the process proceeds to step S ₄ from Step S ₂ via step S _3, steps S ₅ ~ step S
The # 2 'switch 5b is timed turned by _12, after turning sets the fault detection timing Ty in step S _13, step S
₁₄ system power supply by loop to S ₁₆ monitors whether a power failure again.

[0095] Then, 'if mains failure is generated in the detection timing Ty the time, i.e. # 1' t2 if more sufficiently slow when opening of the switch 5a is t2 ', the process proceeds from step S ₁₆ to step S ₁₇ The lock standby of the open state of the # 2 'switch 5b is released to hold the # 2' switch 5b in the closed state.

On the other hand, as shown in FIG. 8 (e), the # 1 'switch 5a is opened within the detection time limit Ty from the time t2' and the section #
When system voltage V ₁ of the 1 'is lost, the process proceeds from step S ₁₄ to step S _21, step S _21, step S ₂₂
By, to start the confirmation timer in the lock wait in an open state to return to the step S _1.

[0097] Incidentally, # 1 'switch 5a is, t2' by the recovery of the system voltage V ₀ which segment # 0 of the time ', is timed turned in turned timed Tx = 7 seconds, as shown in FIG. 8 (d) You.

[0098] Then, 'when the power is restored, # 2' section # 1 in the timed supplying control unit 17 of the switch 5b, the process proceeds to step S ₂₃ from step S ₁ through step S _2, this time, since the measurement time T ₁ is sufficiently shorter than the reference time Tref, determined that a malfunction (erroneous detection), the process proceeds from step S ₂₃ to step S _31.

[0099] Then, to release the lock waiting for the open state back by the step S ₃₁ to open the lock flag to "0".

[0100] Further, the process proceeds from step S ₃₁ to step S _3, this time, since not being open lock, after which the process proceeds from step S ₃ to step S _4, turned timed Tx (= 0
Set the seconds), immediately # 2 'by introducing a switch 5b section # 2' to recover from step S ₅ the loop of steps S _7.

Therefore, when such a changeover of the upper system occurs, the # 2 'switch 5b as in the prior art is used.
Is not erroneously locked in the open state, and the healthy section after section # 2 'is reliably restored.

Next, the operation corresponding to claim 2 will be described. When submitting the above # 2 'switch of the control object such as a switch 5b, passed-on time period Tx set in step S ₄ in FIG. 3, even if the actual input control in step S _8, A situation may occur in which the segment switch is not turned on within the turn-on confirmation time limit Ts of about one second set due to any cause such as an abnormality or a failure of the segment switch.

Conventionally, when such a situation occurs, the sectional switch is unconditionally locked in an open state in order to prevent an unexpected accident from occurring. However, in this embodiment, There is no problem with the section switch. For example, if a situation occurs where the switch is not turned on due to the timing of switching to the upper system and turning on, the section switch is turned on to prevent unnecessary locking of the open state as much as possible. to reason, in the control program of the control unit 25, step S ₉ of FIG. 4 to
S _12, the S _32, S ₃₃ provided, after the output of the input control step S _8, when the confirmation timing Ts is not also turned elapsed,
The process proceeds from step S ₁₂ to step S _32, is set to lock wait in an open state, to start the confirmation timer by step S _33.

[0104] Further, to monitor whether the system power supply upstream is restored back to the step S ₁ in FIG. 3, a short period of time when the system power source on the upstream side power recovery is the comparison of step S ₂₃ based, unlock standby in an open state in step S _31.

[0105] Then, repeated input control in step S ₃ and subsequent steps, when the feeding error due to timing of the sectionalizing switches of the input power failure and recovery of the system power source is
The section switch is turned on without being locked in the open state, and unnecessary open lock is prevented as much as possible to further improve the control performance.

By the way, if this function is unnecessary from the viewpoint of processing capacity, speed, etc., steps S _{10 to} S ₁₂ , S _{12 in} FIG.
_32, it eliminates the S _33.

The switching time of the controlled switch is not limited to 0 second, but may be a timed period. In this case, the same effect as described above can be obtained.

The memory 26 of the switch control device 17
The control program of a is not limited to FIGS.

Various setting parameters such as the reference time Tref may be appropriately set.

(Other Embodiment) Next, another embodiment of the present invention will be described with reference to FIG. In this embodiment, the # 1 "switch 5c in FIG. 13 is a segmented switch to be controlled, and its control device 6 is replaced by a control device 17.

The operation performed when a two-line ground fault similar to that shown in FIG. 13 occurs will be described with reference to FIGS. 9 (a) to 9 (c) corresponding to FIGS. 14 (a) to 14 (c). I do.

In this case, when the line voltage Vac ₀ in the section # 0 ″ disappears at the time t1 ″ with the circuit breaker 13 of the substation 12 closed as shown in FIG. Due to the disappearance, the # 1 'switch 5c as shown in FIG.
Is opened, and then the fuse 15a is blown to change to a one-line ground fault, the line voltage Vac _{0 in} the section # 0 ″ becomes t2 ″.
Sometimes recover.

Immediately after the # 1 "switch 5c is turned on based on this voltage restoration, the circuit breaker 13 trips and opens at t3" based on the detection of an accident of one-line ground fault. 1 "when the control of the switch 5c is that the process proceeds to step S ₂₂ through step S ₂₁ from step S ₁₄ in FIG. 5, # 1" start confirmation timer switch 5c is controlled to lock wait in an open state I do.

When the line voltage Vac ₀ is restored at time t4 ″ due to the re-closing of the circuit breaker 13, the re-closing detection time T
₁ is compared with its reference time Tref. At this time, T ₁
Since ≦ Tref, steps S ₁ , S ₂ , S _{23 in} FIG.
Proceeds to step S ₃₁ via the, reset the lock wait in an open state, step S ₃ to S ₇ and Step S ₈ to S
_{In step 11} , the # 1 "switch 5c is turned on.

When the circuit breaker 13 trips at the time t5 "and recloses again at the time t6", the # 1 "switch 5c opens and closes in response to this opening and closing.

Therefore, also in this case, as in the prior art, #
The 1 ″ switch 5c is not erroneously locked in the open state, and system power failure after fuse blowing is avoided.

[0117]

The present invention has the following effects. First, in the case of claim 1, it is not the original accident power failure,
For example, an instantaneous system power failure occurs due to system switching due to a higher-level accident, etc., and based on a shift in switching timing between the section switches, etc., immediately after power recovery from this system failure, the section switches 5a, 5a, When a power failure occurs again on the upstream side of 5b, 5c, the sectional switches 5a, 5b, 5c are switched to determine whether or not this power failure has occurred in the detection of an accident section based on the reclosing of the time-sequential circuit breaker 3. When the lock is released in the released state, the lock is released and the confirmation timer is started.

When the system power supply is restored in a short time within the judgment reference time, not during the original accidental power failure, the open / standby lock standby of the sectional switches 5a, 5b, and 5c is released and closed.

Therefore, when a higher system switching or the like occurs instead of the original accidental power failure, the controlled switches 5a, 5b, 5c are not unnecessarily locked in the open state, and the controlled switches are not locked. Unnecessary locking of the switches 5a, 5b, 5c in an unnecessary open state can be reliably prevented, and the reliability and the like of the division control of the power system can be improved.

Next, in the case of claim 2, even if the input control of the ON command of the segmented switches 5a, 5b, 5c to be controlled occurs, if the input is not performed within a certain time limit for some reason,
The segment switches 5b and 5c are not immediately locked in the open state as in the prior art, and the confirmation timer is started by setting the segment switches 5b and 5c to the open lock standby.

When power is restored on the upstream side of the segment switches 5b and 5c within the judgment reference time, the lock waiting in the open state is released and the segment switches 5b and 5c are turned on again. When a closing error occurs due to a timing deviation or the like, not due to an abnormality or a failure of the switch, the sectional switches 5a, 5b, and 5c are closed, and the unnecessary open lock is reliably prevented, and the power system The reliability of the sorting control is further improved.

[Brief description of the drawings]

FIG. 1 is a single-phase connection diagram of one embodiment of the present invention.

FIG. 2 is a detailed circuit block diagram of the switch control device of FIG. 1;

FIG. 3 is a first flowchart for explaining the operation of FIG. 2;

FIG. 4 is a second flowchart for explaining the control in FIG. 2;

FIG. 5 is a third flowchart for explaining the control in FIG. 2;

6 (a) to 6 (i) are timing charts for explaining the operation of FIG. 2 at the time of an accident power failure.

7 (a) is a single-phase connection diagram when an accident occurs in the upper system of FIG. 1, and FIG. 7 (b) is a single-phase connection diagram when normal standby switching is performed in accordance with the accident of the upper system in FIG. It is a connection diagram.

8 (a) to 8 (g) are timing charts for explaining the operation of FIG. 2 when the upper-level regular standby switching is performed.

9 (a) to 9 (c) show another embodiment 2 of the present invention.
FIG. 6 is a timing chart for explaining the operation when the fuse is blown after a phase ground fault (a different phase ground fault) occurs and the phase shifts to a one-phase ground fault.

FIGS. 10 (a) and (b) are single-phase connection diagrams of a conventional system, respectively, and (c) is a single-line connection diagram of another conventional system in which a segmented switch having a closing limit of 0 seconds and 7 seconds is mixed. is there.

FIG. 11 is a single-line diagram of a conventional example in which the upper level is composed of a service system and a backup system.

12 (a) to 12 (g) are timing charts for explaining the operation when normal standby switching is performed in response to an accident in the upper system of FIG. 7;

FIG. 13 is a single-phase connection diagram of another conventional example.

14 (a) to (c) are timing charts for explaining the operation when the fuse is blown and a transition is made to a one-phase ground fault after the occurrence of the two-phase ground fault (out-of-phase ground fault) in FIG. 9; .

[Explanation of symbols]

 1,12 Substation 3,13a-13c Circuit breaker 4,14 Distribution line 5,5a, 5b, 5c Division switch 6,17 Switch control device 22 Backup power supply 29 Timer circuit section

Claims (2)

[Claims] 1. After a circuit breaker is opened due to an accident and a power failure occurs, the circuit breaker of the substation is reclosed and reclosed by time-sequential test charging to open a sectional switchgear in the accident section. In a switch control device for each section switch of the power system that locks in a state and restores a healthy section upstream from the accident section when the circuit breaker is reclosed again, a backup power supply that forms an operating power supply during a system power failure; Opening the controlled switch and setting an open flag when a system power failure occurs after the closed switch of the controlled switch is closed based on reclosing of the circuit breaker, and opening the controlled switch. Means for controlling to a state lock wait state and starting a confirmation timer; and when the upstream side of the controlled switch is restored during the release state lock wait state, the measurement time of the confirmation timer and a predetermined time are determined. Means for comparing with a judgment reference time; when the measurement time of the confirmation timer becomes equal to or less than the judgment reference time, the release flag is reset to release the lock standby in the open state; Means for closing the lock state of the open state when the measurement time of the confirmation timer is longer than the determination reference time, and locking the partitioned switch to be controlled to the open state. A switch control device characterized by the above-mentioned. 2. An open flag is set when the controlled switch is not closed within a certain closing time by closing control, and the controlled switch is controlled to open lock waiting and reclosed. Means for activating a confirmation timer, and means for comparing the measured time of the confirmation timer with a predetermined judgment reference time when power is restored on the upstream side of the controlled segmented switch during standby for lock of the open state. Means for resetting the release flag when the measurement time of the confirmation timer becomes equal to or less than the determination reference time, releasing the lock standby in the released state, and re-closing the controlled switch to be controlled; Means for terminating lock release of the open state when the measurement time of the timer becomes longer than the determination reference time and locking the controlled switch to the open state. The switch control device according to claim 1, wherein